Awawada,
Thanks for reply each link gave several possibilities and I had to read/try each one. Unfortunately none worked/applied to my situation. The 529/537 events occurr when I'm logged into the computer. I suspect its some type of malware program because when my pc is turned off I do not get any of these in the event log. Both the links state that the solution is to install the latest sp for windows server 2003 and XP professional. I already have the latest sp for each installed. Would appreciate any other suggestions as to how to track down the cause/fix for this. Please let me know if any additional information about the problem is needed.

If you think its a malware find it out. To remove or find malware i use www.pandasecurity.com. Its a high recommended Antivirus Engine. But because of so many viruses i recomend to scan with many antivirus Engines as possible. So you find below some useful links:

Thanks awawada. I have already tried several antivirus/malware tools but found nothing. Since this is our main domain server I have to schedule saturday to work so as not to disturb other employees. will post next week as this saturday was available. Thanks for your help.

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